Question

Question 34 Using the table, what percentage of the participated marijuana as their greatest drug problem? Greatest Problem Drug % Lifetime use % Substance Marijuana 71.7 92.8 Nicotine 16.4 76.4 Alcohol 5.6 89.2 Cocaine/crack 2.5 32.1 Club Drugs 2.1 25.1 Inhalants 1.8 18.4 18.4% 71.7% 2.5% 92.8%

Answer 1

Question 34) The table says that The Percentage of people who considered marijuana as their greatest problem drug is 71.7%

Question 37)

Class Frequency 1-3 64 4-6 43 7-9 24 10 - 12 18 13 - 17 16 18 - 22 13 23 - 28 7 Solution: Class Frequency 0 Mid value (x) (1) (2) (3) X -A d = = x - 11 h A = 11, h = 1 fod (5) = (2) (4) of (7) 1-3 64 2 -9 -576 64 4-6 43 5 -6 -258 107 7-9 24 8 -3 -72 131 10 - 12 18 11=A 0 0 149 13 - 17 16 15 4 64 165 18-22 13 20 9 117 178 23 - 28 7 25.5 14.5 101.5 185 --- --- --- --- n = 185 Ef.de - 623.5 ---

To find Median Class nth = value of observation 2 () = value of 185 th 2. observation = value of 92nd observation From the column of cumulative frequency cf, we find that the 92nd observation lies in the class 4 - 6. · The median class is 3.5 - 6.5. Now, :: L = lower boundary point of median class = 3.5 :: n = Total frequency = 185 :. cf = Cumulative frequency of the class preceding the median class = 64 :: f= Frequency of the median class = 43 :: c = class length of median class = 3 n ž - of Median M=L+ f = 92.5 - 64 = 3.5+ 43 . 3 28.5 = 3.5+ = 3 43 = 3.5 + 1.9884

= 5.4884

Or another formula for Median is the centre of the Median class,

From our calculations median class came out to be 3.5 - 6.5
So the Centre of the median class is = (3.5+6.5)/2 =10/2 = 5